One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,13)(12,14)(15,16)(17,18,20,22)(19,24,26,29)(21,23,28,25)(27,30,32,31)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(18,22)(23,25)(24,29)(30,31) involution — undirected(1,3,4,7)(2,6,5,8)(11,15)(13,16)(18,23)(21,28)(22,25)(24,30)(27,32)(29,31)(11,15)(13,16)(17,19,20,26)(18,24,22,29)(21,27,28,32)(23,30,25,31)(10,14)(13,16)(19,26)(24,29)(27,32)(30,31) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.